If you select a square or rectangle layout for your proofing events and you want to control how the images are cropped to display in this layout, you can change the image focal point on each image in your event.
After you open the event from the proofing control panel, click on a picture, and click edit focal point.
You can drag and drop the focal point to where you want the center of the image to be in the grid view. Click the x to exit the editor, and click save changes.
To continue editing focal points on other images, click go back to see the collection of images in the gallery and access other images to edit their focal points.